Improvement in pumps



A thereof, reference being had to the accompanying drawof the valve G, and the stem y passes through said tube :l I @time i Weisser-M OSCAR SNELL, OF WILLIAMSBURG, OHIO.

Lette/rs Patent No. 84,846, dated December 8, 1868.

IIVIROVEMENT IN PUMPS.

The Schedule referred to these Letters Patent and making part of the sauneA To all 'whom tt may concern;

Be it known that I, OSCAR SNELL, of Williamsburg, Clermont county, Ohio, have invented a new and useful Improvement in Pumps; and I do hereby declare the following to be a full, clear, and exact descriptiop ings, making part of this specification.

This invention relates to that class of solid-plunger pumps, which are generally employed for forcing hot feed-water into steam-boilers and M yimprovement consists in providing the pump'with a single slide-valve, to which a positive movement is imparted by means of a suitable cam, and in so constructing the chest or chamber in which the said valve Works, that it will serve alsoas an air-chamber, to make the flow of water constant and uniform.

In the -accompanying drawings- Figure l is a vertical section of a pump embodying my improvement, theVslide-valve being in such a position as to open communication between the pimp and suction-pipe.

Figure 2 is asection of the working-parts of the pump, with the valve in the reverse position to that shown in g. l, so as to open communication lbetween the pump and discharge-pipe.

Figure'S is an elevation of the cam which operates the slide-valve. l

A represents the barrel of a feed-pump, having the customary stuing-box, B, and solid plunger, 0,'the latter being driven by a pitman, D, which'is connected to the wrist e of the driving-shaft E.

Projecting from one side of the pump-barrel isachest, F, which contains a slide-valve, G, whose stem, g, is operated by a cam, H, that is keyed to the driving shaft E.

The valve G covers two ports, I I', the upper one of which, I', leads into the pump-barrel A, while the lower` one, I, communicates with the suction-pipe J.

The valve-chest is arranged to act as an air-vesselh in the following manner:

Projecting downwardly from the top of said chest is a tube, K, of sufcient length to permit the full stroke and plays within the stufling-box f, and it will be seen that this provision of the tube K causes the upper part Yof the valve-chest to serv'e as an air-vessel, by which means feed-water is delivered through the dischargepipe L in a continuous stream.

The shaft E may be driven by a belt, passing around the pulley N. The operation of the pump is as follows: p When the piston C is ascending, as shown in Iig. 1,

the ports, I I', and water, consequently, flows up the suction-pipe J, and through said ports, I I', into the pump-barrel A, which ow continues during the ascent of the piston. Y *f stroke, the action of the cam H instantly reverses the of the contents of the pump being discharged through 'the`port I', valve-chest E, and pipe L, in'to the boiler.

It will be seen that, as a positive movenent is given to the valve, the pump is certain of being filled and emptied at every alternate stroke, and there is no danger of the pump becoming inoperative on account of the accumulation of steam within it; vneither is there any liability of the valve becoming choked with sand or other foreign substances in the feed-water.

As leather and India-rubber valves are liable to shrink and shrivel when brought in contact with very hot water, and thereby impair, if not destroy, the eiiiciency of the feed-pump, and as no such objections canbebrought to bear against a metallic valve, when operated by a positive movement, independent of theiiow of water, the advantages of my arrangement will be understood by all.

' In the drawings, my improvement is shown as applied to a single-'actin g pump, but it is evident that with acting one.

If preferred, the valve-chest may be extended as high as the top ofthe pump-cylinder, so as to increase the capacity of the air-vessel.

The tube K, instead of being secured to the top of the valve-chest, as here shown, may proj ect up through the upper end of said tube.

My improvement may be applied to an ordinary handthat the operating-lever or handlewill move the slidevalve at the termination of each stroke.

secure by .Letters Patent:

In combination with the pump proper, A, I claim the valve-chest F, constituting, also, 'an air-chamber, the slide-valve G, tube K, and discharge-pipe L, when conthe purposes herein set fort-h.

In testimony of which invention, I hereunto set my hand. y

OSCAR SNELL. Witnesses:

GEO. H. KNIGHT,

the valve G is in such a position as to cover bothof WM. S. MGLEAN.

As soon as the piston has completed its upward position of the valve G, as shown in iig. 2, which permits a very slightalteration it can be adapted to-a doublethe same, and the stuffing-box f may be screwed on to,

pump, by arranging the apparatus in such a manner The following is what I claim as new, and desire to Y structed and arranged, to operate in the manner and for 

